CONCORD WASTEWATER PLAN, CALIFORNIA

Period of Record General Climate Summary - Heating Degree Days

Station:(041967) CONCORD WASTEWATER PLAN
From Year=1991 To Year=2012
Heating Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
65 485 343 259 171 61 13 1 0 4 60 279 481 2156
60 330 203 123 66 10 1 0 0 0 10 146 326 1215
57 239 126 64 29 1 0 0 0 0 2 83 238 781
55 181 82 36 14 0 0 0 0 0 0 52 182 547
50 65 17 4 1 0 0 0 0 0 0 11 67 164
Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu